New cephem compounds of the formula:
wherein R1 is phosphono or protected phosphono;
R2 is lower aliphatic hydrocarbon group;
R3 is pyridinio or pyridiniothio, each of which may
have suitable substituent(s), and
Y is N or CH;
and pharmaceutically acceptable salts thereof, processes for their preparation and pharmaceutical compostions comprising them in association with a pharmaceutically acceptable, substantially non-toxic carrier or excipient. The invention also relates to the starting compounds
and their preparation and to processes for preparing the starting compounds
新的 Cephem 化合物,其式如下
其中 R1 是膦酰基或受保护的膦酰基;
R2 是低级脂肪烃基
R3 是
吡啶硫代或
吡啶二
硫代,其中每个可
具有合适的取代基,以及
Y 是 N 或 CH;
及其药学上可接受的盐、制备工艺以及由它们与药学上可接受的、基本上无毒的载体或赋形剂组成的药物复合物。本发明还涉及起始化合物
及其制备,以及制备起始化合物的工艺